'''Generation II''' (also known as the '''metal''' or '''precious metal generation''') is the second generation of Pokémon games, and sequels to the original Generation I games ''Red and Green'' (''Red and Blue'' for international players).

'''Generation II''' (also known as the '''metal''' or '''precious metal generation''') is the second generation of Pokémon games, and sequels to the original Generation I games ''Red and Green'' (''Red and Blue'' for international players).

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*Berries are introduced (in the third generation would be replaced by other types) and differentiate between objects that the [[Pokémon]] can be used by themselves in combat and those who do not.

*Berries are introduced (in the third generation would be replaced by other types) and differentiate between objects that the [[Pokémon]] can be used by themselves in combat and those who do not.

*Certain [[Pokémon]] are now able to evolve when traded while holding a particular item.

*Certain [[Pokémon]] are now able to evolve when traded while holding a particular item.

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*[[Pokérus]] appears for the first time.

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*[[Pokérus]] appears for the first time.

*A new feature called the [[PokéGear]] appears that has the capabilities of a mobile phone, allowing trainers to challenge you to a rematch, and radio, with various radio shows and music.

*A new feature called the [[PokéGear]] appears that has the capabilities of a mobile phone, allowing trainers to challenge you to a rematch, and radio, with various radio shows and music.

*Some [[Pokémon]] are updated with new types or characteristics ([[Magnemite]] and [[Magneton]] become {{Type|Electric}}/{{Type|Steel}} type, for example).

*Some [[Pokémon]] are updated with new types or characteristics ([[Magnemite]] and [[Magneton]] become {{Type|Electric}}/{{Type|Steel}} type, for example).

Generation II (also known as the metal or precious metal generation) is the second generation of Pokémon games, and sequels to the original Generation I games Red and Green (Red and Blue for international players).

Generation II was the first Generation where Pokémon began to expand, introducing 100 new Pokémon which could not be found in the original Generation I games. Many of these Pokémon expand the evolution families of older Pokémon, while a majority of them are brand-new evolutionary families.

These games were initially called "Pocket Monsters 2". Generation II events occur three years after Generation I, and occur simultaneously with the events of Generation IV.

Possibility to visit Kanto years after Red/Blue/Yellow, with trainers with high levels, the opportunity to complete the eight Gyms in Kanto (being 16 in total in the game), and the ability to fight both Blue, or the rival from the previous generation and Red, the protagonist of the previous generation.

In Crystal, a female player character, Kris, can be chosen for the first time.

In Crystal, moving sprites are given to opposing Pokémon and Pokémon on their stats page.